the cause of genetic irregularities in many breeds of dog is not so much that dogs are being bred for looks or to meet other narrow criteria

the cause of genetic irregularities in many breeds of dog is not as much their being bred for looks or meeting other narrow criteria as much

it is not so much the cause of genetic irregularities in many breeds of dog that they are being bred for looks or meeting other narrow criteria as much

it is not so much that the cause of genetic irregularities in many breeds of dog is their being bred for looks or meeting other narrow criteria so much

it is not so much the cause of genetic irregularities in many breeds of dog to be bred for looks or to meet other narrow criteria